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Study on the Model for Predicting Gases Adsorption Equilibria above Critical Temperatures
Li Ming, Gu Anzhong
Institute of Refrigeration and CryogenicEngineering, Shanghai Jiaotong University, Shanghai 200030
Abstract:
Experimental adsorption isotherms of CH4 and N2 higher than critical temperatures on K02 activated carbon were measured with the volumetric method The pressure and temperature ranges were 0~12 MPa and 273~333 K respectively. A model, which took into account the adsorbate properties above critical temperatures and the adsorbent surface heterogeneity by pore size distribution, was proposed in this paper to predict the equilibrium data only using one adsorption isotherm. The gamma distribution was adopted to express the pore size distribution of the activated carbon, and the adsorption potential was calculated bythe 10-4-3 equation for slit shape micro pores. The relationships between the adsorbate density, the saturated adsorption amount and the equilibrium temperature have been discussed in detail. Through this method, the experimental adsorption data of CH4 and N2 were compared with the prediction equilibria. The study illustrates that the predicting method could present the adsorption equilibria accurately in the whole research range. And the mean relative deviations of the prediction of CH4 and N2 are only about 1.9% and 2.9%. This proves that the analyses of the adsorbate properties are reasonable. Inaddition, the model was applied to calculating the equilibrium data of various supercritical adsorption systems published in literatures. Despite different adsorbents and equilibriaconditions, the investigation results demonstrate that the suggested model performs well in predicting the gases adsorption equilibrium data with all mean relatived eviations less than 6.8%. Therefore, the model could be utilized to calculate the gases adsorption equilibrium data above critical temperatures in a wide range.
Key words:  Adsorption isotherm, Langmuir equation, Critical temperature, Activated carbon
FundProject:
气体临界温度以上吸附平衡的预测研究
李明*, 顾安忠
上海交通大学制冷与低温工程研究所,上海,200030
摘要:
采用容积法测定了CH4和N2在微孔活性炭K02上的吸附平衡数据,温度为273~333 K,压力为0~12 MPa.提出了一个可以从单一气体吸附等温线预测其它条件下吸附平衡的理论模型.该模型考虑了临界温度以上吸附相密度和饱和吸附量与温度的关系,并采用孔径分布来表征吸附剂表面吸附势场的不均一性,局部方程使用Langmuir描述.利用此模型预测了CH4和N2在K02活性炭上的吸附平衡,在所研究的温度、压力范围内的整体预测偏差不超过3%.另外,对文献中不同实验条件下气体临界温度以上的吸附平衡进行了研究,在较宽的范围内也取得了很好的预测结果.
关键词:  吸附等温线  Langmuir方程  临界温度  活性炭
DOI:10.1088/1674-0068/17/5/602-606
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